| End-Use Application | Identify the finished product, service conditions, contact requirements, expected lifetime, and appearance standard. | Examples include packaging film, injection-molded parts, pipes, fibers, agricultural film, consumer goods, and automotive components. | The same color or additive concentrate may perform differently in different products and processes. | Application history, technical data sheet, processing recommendations, and representative molded or extruded samples. | Run a trial using the intended resin, equipment, cycle conditions, and final product geometry. |
| Carrier Resin Compatibility | Specify the base polymer and grade, such as polyethylene, polypropylene, polystyrene, ABS, PET, polyamide, or thermoplastic polyurethane. | The carrier should be chemically and rheologically compatible with the processing resin; use a polymer-specific concentrate whenever possible. | Poor compatibility can cause streaks, plate-out, weak weld lines, haze, reduced impact strength, or unstable dosing. | Carrier composition, compatibility statement, recommended resin list, and results from application-specific trials. | Check dispersion, mechanical properties, surface appearance, and processing stability after molding or extrusion. |
| Masterbatch Type | Define whether the requirement is a color masterbatch, white or black concentrate, additive masterbatch, or a multifunctional formulation. | Use a single-purpose formulation where performance, compliance, and process control are critical; use multifunctional products only when interactions are validated. | Different concentrate types have different loading levels, dispersion behavior, and regulatory considerations. | Full formulation category, active ingredient information where legally disclosable, and compatibility limitations. | Compare the proposed product with a control sample under identical conditions. |
| Target Let-Down Ratio | Define the masterbatch addition rate needed to achieve the required color, opacity, or additive performance. | Many color concentrates are used around 1%–5%; white, black, and additive concentrates may require different levels depending on formulation and opacity targets. | The dosage affects cost, cycle consistency, mechanical properties, and final resin composition. | Recommended let-down ratio, color strength data, opacity data, and dosage tolerance. | Test at the nominal dosage and at practical upper and lower limits, such as ±10% of the target rate. |
| Color and Appearance | Define the color reference, visual tolerance, gloss level, transparency or opacity, and surface-finish requirements. | Use an approved physical standard and instrumental color limits, commonly expressed with CIELAB values and a defined color-difference tolerance. | Visual assessment alone can vary between observers, lighting conditions, and production lots. | Color standard, laboratory drawdowns or plaques, spectrophotometer data, and batch-to-batch color-control procedure. | Measure molded plaques or film under consistent thickness, illumination, background, and instrument settings. |
| Pigment or Additive Concentration | Set the required pigment loading, additive content, or functional active level, subject to formulation confidentiality. | The required concentration varies substantially by pigment type, opacity, shade, additive chemistry, and target dosage. | Higher concentration is not automatically better; excessive loading can reduce dispersion and alter mechanical or rheological properties. | Declared concentration range, quality-control method, and performance data at the recommended let-down ratio. | Confirm active content using an agreed analytical method or an independent laboratory where necessary. |
| Processing Temperature | Define barrel, melt, die, mold, and residence-time conditions for the intended process. | The concentrate should remain stable throughout the actual processing window and should not release unacceptable decomposition products. | Thermal mismatch may cause fading, gas formation, odor, deposits, or loss of additive functionality. | Recommended processing window, thermal stability information, and maximum temperature or residence-time limitations. | Conduct a controlled heat-history trial at the highest expected temperature and residence time. |
| Melt Flow and Rheology | Match the concentrate flow behavior with the base resin and processing equipment. | Specify the test method, temperature, and load for melt mass-flow rate; the target should support stable feeding and mixing rather than simply maximize flow. | A large rheological mismatch can produce poor mixing, surging, uneven color, or dosing variation. | Melt-flow data measured to the applicable polymer test method, along with recommended processing equipment. | Check feeder accuracy, extruder pressure, output stability, and visual uniformity during a production-like trial. |
| Dispersion Quality | Define the acceptable level of pigment or additive dispersion, including limits for specks, streaks, gels, and agglomerates. | Requirements should be tighter for thin film, fiber, wire, optical, and high-gloss applications than for many opaque molded parts. | Poor dispersion can cause visible defects, weak spots, filter blockage, and inconsistent functional performance. | Microscopy or film-screening results, defect limits, and documented dispersion-control procedures. | Use a standardized plaque, film, or filter-pressure test appropriate to the application. |
| Moisture and Drying | Set the incoming moisture limit and determine whether pre-drying is required for the concentrate and base resin. | Moisture-sensitive polymers and applications generally require tighter control; the limit must be defined by polymer, process, and product quality. | Excess moisture may cause splay, bubbles, hydrolysis, reduced molecular weight, or dimensional instability. | Moisture specification, packaging barrier information, recommended drying temperature and time, and test method. | Measure moisture before processing and inspect the final product for splay, voids, and mechanical-property changes. |
| Migration and Food Contact | Define whether the product contacts food, drinking water, pharmaceuticals, cosmetics, or other regulated contents. | All pigments, additives, carriers, and impurities must meet the applicable market-specific requirements for the intended contact condition. | A general compliance statement may not cover the exact polymer, dosage, temperature, time, or food-simulant condition. | Declaration of compliance, restricted-substance statement, migration data where applicable, and change-notification policy. | Review the documentation with the finished-product compliance team and perform confirmatory testing when required. |
| Light, Weather, and Chemical Resistance | Specify exposure to sunlight, ultraviolet radiation, moisture, heat, cleaning agents, oils, fuels, or agricultural chemicals. | Set a required exposure duration, color-change limit, and mechanical-retention target based on the product’s service life. | Indoor and outdoor durability requirements can differ greatly even when the initial color is identical. | Accelerated-weathering results, chemical-resistance data, pigment or additive durability classification, and test conditions. | Use an agreed accelerated-aging method and, for critical products, correlate results with field exposure. |
| Mechanical and Functional Properties | Define acceptable changes to tensile strength, elongation, impact, stiffness, seal strength, transparency, or barrier performance. | Set limits relative to the uncolored or untreated resin, such as a maximum permitted reduction in a critical property. | A concentrate that meets color targets may still make the finished product unsuitable for its intended use. | Comparative mechanical and functional test results at the proposed dosage. | Test finished parts or films against an approved control using the applicable product standard. |
| Recycling and Circularity | Define recycled-content percentage, recyclability objectives, regrind use, and compatibility with the intended recycling stream. | The masterbatch should not introduce unnecessary incompatible polymers, hazardous substances, or colorants that interfere with recycling identification or reuse. | Color and additive choices can affect sorting, recycled-resin quality, and compliance claims. | Recycled-content compatibility data, composition statement, recyclability assessment, and traceability information. | Evaluate multiple recycled-resin lots and test appearance, odor, mechanical performance, and process stability. |
| Quality Consistency | Define lot-to-lot tolerances for color, moisture, melt flow, pellet dimensions, active content, and contamination. | Use numerical acceptance limits that reflect the sensitivity of the finished product rather than relying only on “pass” or “fail” descriptions. | Consistent raw material quality reduces line adjustments, scrap, customer complaints, and production downtime. | Certificate of analysis, retained-sample policy, batch traceability, statistical process-control data, and corrective-action procedure. | Approve samples from more than one production lot before commercial release. |
| Feeding and Pellet Design | Specify pellet size, shape, bulk density, dust level, feeder type, and risk of bridging or segregation. | Pellets should feed consistently through the selected gravimetric or volumetric dosing system without excessive fines or agglomeration. | Poor feeding can create dosage fluctuations even when the formulation itself is correct. | Pellet specifications, bulk-density range, dust-control data, and feeder recommendations. | Monitor feeder accuracy and hopper behavior during a sustained production run. |
| Supply Capacity and Lead Time | Define annual demand, order frequency, safety-stock policy, required delivery regions, and peak-volume needs. | Set measurable expectations for sample delivery, standard-order lead time, emergency support, and capacity reservation. | A technically suitable product is not commercially suitable if supply interruptions stop production. | Capacity statement, lead-time history, contingency plan, inventory policy, and documented change-control process. | Review delivery performance and conduct a supply-risk assessment before final approval. |
| Technical Support | Define the level of support required for formulation, processing optimization, troubleshooting, and scale-up. | Support should include written processing guidance, trial assistance, root-cause analysis, and response-time commitments. | Fast technical support can reduce downtime and shorten the qualification cycle. | Technical contact details, troubleshooting workflow, application-laboratory capabilities, and service-level expectations. | Use a structured trial report covering dosage, temperature, screw speed, output, defects, and corrective actions. |
| Total Cost of Use | Compare concentrate price, let-down ratio, base-resin displacement, scrap, energy, cleaning time, and quality costs. | Evaluate cost per finished kilogram or per finished part, not only price per kilogram of masterbatch. | A higher-priced concentrate may reduce total cost if it requires less dosage or creates less waste. | Commercial quotation, recommended dosage, yield calculation, minimum order quantity, and cost-of-quality assumptions. | Calculate total landed cost using actual trial consumption and measured scrap rates. |
| Packaging and Shelf Life | Define pack size, moisture barrier, labeling, storage temperature, storage humidity, and first-in-first-out requirements. | Packaging should protect pellets from moisture, contamination, and physical damage throughout the stated shelf life. | Improper storage can change moisture, pellet integrity, color strength, or additive performance. | Shelf-life statement, storage instructions, packaging specification, lot code, and resealing guidance. | Inspect packaging on receipt and test aged or stored material when the product has a long inventory cycle. |
| Supplier Qualification Score | Assign weighted scores to technical performance, compliance, quality, supply reliability, service, sustainability, and total cost. | A practical model may allocate 30% to technical performance, 20% to quality consistency, 15% to compliance, 15% to supply reliability, 10% to total cost, and 10% to service and sustainability. | A weighted model prevents low price from outweighing critical safety, quality, or supply risks. | Completed questionnaire, supporting records, sample-trial results, audit findings, and agreed corrective-action plan. | Approve only suppliers that meet all mandatory requirements and achieve the defined minimum overall score. |
